Remove mute for testValidationFailsWhenUpdateWithInvalidPath (#134897)

This was fixed in: https://github.com/elastic/elasticsearch/pull/134843

muted-tests.yml

@@ -546,9 +546,6 @@ tests:
 - class: org.elasticsearch.xpack.esql.qa.single_node.GenerativeIT
   method: test
   issue: https://github.com/elastic/elasticsearch/issues/134407
-- class: org.elasticsearch.xpack.security.transport.CrossClusterSigningConfigReloaderIntegTests
-  method: testValidationFailsWhenUpdateWithInvalidPath
-  issue: https://github.com/elastic/elasticsearch/issues/134805
 - class: org.elasticsearch.compute.lucene.TimeSeriesSourceOperatorTests
   method: testSliceIndex
   issue: https://github.com/elastic/elasticsearch/issues/134808